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LOS ANGELES, CA - SEPTEMBER 29: Construction crews continue to demolish a portion of the Mulholland Drive bridge along the 405 Freeway September 29, 2012 in Los Angeles, California. The 405 Freeway is completely shut down for a 10-mile stretch this weekend for the demolition, which is part of a larger $1-billion freeway improvement project. (Photo by Kevork Djansezian/Getty Images)